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Chapter 7: Internal Energy

Matter & Interactions
Pages: 284 - 322

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50 Questions for Chapter 7: Internal Energy

  1. A sky diver whose mass is 90 kg, is falling at a terminal speed of 60 m/s. What is the magnitude of the force of the air on the sky diver?

    Found on Page 308
  2. A coffee filter of mass 1.4g dropped from a height of 2m reaches the ground with a speed of 0.8m/s . How much kinetic energyKairdid the air molecules gain from the falling coffee filter?

    Found on Page 309
  3. Describe a situation in which it would be appropriate to neglect the effects of air resistance.

    Found on Page 317
  4. If you let a mass at the end of a string start swinging, at first the maximum swing decreases rather quickly, but once the swing has become small it takes a long time for further significant decrease to occur. Try it! Explain this simple observation.

    Found on Page 310
  5. Describe a situation in which neglecting the effects of air resistance would lead to significantly wrong predictions.

    Found on Page 317
  6. Throw a ball straight up and catch it on the way down, at the same height. Taking into account air resistance, does the ball take longer to go up or to come down? Why?

    Found on Page 317
  7. (a) Using the equation for the amplitudeA , show that if the viscous friction is small, the amplitude is large when ωDis approximately equal toωF . Using the equation involving the phase shiftφ , show that the phase shiftis approximately0° for very low driving frequencyωD , approximately180° for very high driving frequencyωD , and90° at resonance, consistent with your experiment.

    Found on Page 315
  8. You drag a block with constant speedacross a table with friction. Explain in detail what you have to do in order to change to a constant speed of 2von the same surface. (That is, the puzzle is to explain how it is possible to drag a block with sliding friction at different constant speeds.)

    Found on Page 317
  9. Question: Figure 7.48 is a portion of a graph of energy terms vs, time for a mass on a spring, subject to air resistance. Identify and label the three curves as to what kind of energy each represents. Explain briefly how you determined which curve represented which kind of energy.

    Found on Page 317
  10. Question: A spring has a relaxed length of 6 cm and a stiffness of How much work must you do to change its length from 5cm to 9cm?

    Found on Page 317

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